<ul>
    <li><a href="{:url('index/index/index')}"><span>网站首页</span></a></li>
    {volist name="menu" id="vo"}

    <li><a href="{$vo1.id|makeurl}"><span>{$vo.catename}</span><i class="touch-arrow-down"></i></a>
        {if condition="$vo['son'] neq ''"}
        <ul>
            {volist name="$vo['son']" id="vo1"}
            <li><a href="{$vo1.id|makeurl}"><span>{$vo1.catename}</span></a></li>
            {/volist}
        </ul>
        {/if}
    </li>
    {/volist}
</ul>